<template>
  <div class="page-loadmore">
    <!--<h1 class="page-title">Pull up</h1>-->
    <Header2 :title="headetitle" />
    <p class="page-loadmore-desc">在列表底部, 按住 - 上拉 - 释放可以获取更多数据</p>
    <p class="page-loadmore-desc">translate : {{ translate }}</p>
    <div class="loading-background" :style="{ transform: 'scale3d(' + moveTranslate + ',' + moveTranslate + ',1)' }">
      translateScale : {{ moveTranslate }}
    </div>

    <div class="page-loadmore-wrapper" ref="wrapper" :style="{ height: wrapperHeight + 'px' }">
      <mt-loadmore :top-method="loadTop" @translate-change="translateChange" @top-status-change="handleTopChange"  :bottom-method="loadBottom" @bottom-status-change="handleBottomChange" :bottom-all-loaded="allLoaded" ref="loadmore">

        <ul class="page-loadmore-list">
          <li v-for="item in list" class="page-loadmore-listitem">{{ item }}</li>
        </ul>


        <div slot="top" class="mint-loadmore-top">
          <span v-show="topStatus !== 'loading'" :class="{ 'is-rotate': topStatus === 'drop' }">↓</span>
          <span v-show="topStatus === 'loading'">
            <mt-spinner type="snake"></mt-spinner>
          </span>
        </div>


        <div slot="bottom" class="mint-loadmore-bottom">
          <span v-show="bottomStatus !== 'loading'" :class="{ 'is-rotate': bottomStatus === 'drop' }">↑</span>
          <span v-show="bottomStatus === 'loading'">
            <mt-spinner type="snake"></mt-spinner>
          </span>
        </div>
      </mt-loadmore>




    </div>
  </div>
</template>

<style>



  .loading-background, .mint-loadmore-top span {
    -webkit-transition: .2s linear;
    transition: .2s linear
  }
  .mint-loadmore-top span {
    display: inline-block;
    vertical-align: middle
  }

  .mint-loadmore-top span.is-rotate {
    -webkit-transform: rotate(180deg);
    transform: rotate(180deg)
  }

  .page-loadmore .mint-spinner {
    display: inline-block;
    vertical-align: middle
  }

  .page-loadmore-desc {
    text-align: center;
    color: #666;
    padding-bottom: 5px
  }

  .page-loadmore-desc:last-of-type,
  .page-loadmore-listitem {
    border-bottom: 1px solid #eee
  }

  .page-loadmore-listitem {
    height: 50px;
    line-height: 50px;
    text-align: center
  }

  .page-loadmore-listitem:first-child {
    border-top: 1px solid #eee
  }

  .page-loadmore-wrapper {
    overflow: scroll
  }

  .mint-loadmore-bottom span {
    display: inline-block;
    -webkit-transition: .2s linear;
    transition: .2s linear;
    vertical-align: middle
  }

  .mint-loadmore-bottom span.is-rotate {
    -webkit-transform: rotate(180deg);
    transform: rotate(180deg)
  }

</style>

<script type="text/babel">
  import Header2 from './Header2'
  export default {
    components: {Header2},
    data() {
      return {
        list: [],
        headetitle:'search',
        allLoaded: false,


        bottomStatus: '',
        wrapperHeight: 0,



        topStatus: '',
        //wrapperHeight: 0,
        translate: 0,
        moveTranslate: 0



      };
    },

    methods: {
      handleBottomChange(status) {
        this.bottomStatus = status;
      },

      loadBottom() {
        setTimeout(() => {
          let lastValue = this.list[this.list.length - 1];
          if (lastValue < 40) {
            for (let i = 1; i <= 10; i++) {
              this.list.push(lastValue + i);
            }
          } else {
            this.allLoaded = true;
          }
          this.$refs.loadmore.onBottomLoaded();
        }, 1500);
      },








      handleTopChange(status) {
        this.moveTranslate = 1;
        this.topStatus = status;
      },
      translateChange(translate) {
        const translateNum = +translate;
        this.translate = translateNum.toFixed(2);
        this.moveTranslate = (1 + translateNum / 70).toFixed(2);
      },
      loadTop() {
        setTimeout(() => {
          let firstValue = this.list[0];
          for (let i = 1; i <= 10; i++) {
            this.list.unshift(firstValue - i);
          }
          this.$refs.loadmore.onTopLoaded();
        }, 1500);
      },

    },




    created() {
      for (let i = 1; i <= 20; i++) {
        this.list.push(i);
      }
    },

    mounted() {
      this.wrapperHeight = document.documentElement.clientHeight - this.$refs.wrapper.getBoundingClientRect().top;
    }
  };
</script>
<style scoped>
  /*卡片*/
  .el-card{
    border-radius: 12px;
    padding: 6px;
  }
  div.row{
    margin: 6px;
  }
</style>
